Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Other solar systems

  1. Aug 10, 2010 #1
    What are the others known solar systems ?
  2. jcsd
  3. Aug 10, 2010 #2
    http://planetquest.jpl.nasa.gov/atlas/atlas_search.cfm [Broken]

    Technically, there is only one Solar system, as this is derived from Sol, our sun's name. So these are the known stellar systems.:smile:
    Last edited by a moderator: May 4, 2017
  4. Aug 10, 2010 #3


    User Avatar
    Science Advisor
    Homework Helper

  5. Aug 10, 2010 #4
    These planets look like stars!
  6. Aug 10, 2010 #5


    User Avatar

    Staff: Mentor

    No, they don't - most look like Jupiter. And in any case, we can't see them directly anyway.
  7. Aug 11, 2010 #6
    Why not?

    From the caption:

    Attached Files:

  8. Aug 11, 2010 #7


    User Avatar

    Staff: Mentor

    Wow, I didn't realize that was possible....

    Anyway, this article implies that that is the only such photo yet taken and it is only possible because the planet is large and orbiting a brown dwarf at a large distance and both are imaged in infrared. A very unusual case. http://www.eso.org/public/news/eso0511/
    Last edited: Aug 11, 2010
  9. Aug 11, 2010 #8

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor
    2017 Award

    In the time since then, a handful of exoplanets have been directly imaged, including in the visible.

    Of course, seeing the shadow is even simpler.
  10. Aug 11, 2010 #9
    There are a few other photos of other planets, but they are definitely still the exception rather than the rule. The http://www.physorg.com/news185795684.html" [Broken] was captured with visible light! As with so many things in astronomy, it's only a matter of time. We're taking the most amazing pictures ever, and I can't wait to see how the technology improves.

    Last edited by a moderator: May 4, 2017
  11. Aug 13, 2010 #10
    As i recall 3 planets - out of which one was actually a brown dwarf - has been observed directly so far.
    But we will be able to see them very soon; New techniques to substract the stellar glare from exoplanets observations, promises to make it possible for todays earth based telescopes to see them

    See the articles at http://www.spacedog.eu/astronomy/exoplanets/ [Broken]

    And with the James Weeb 8m spacetelescope in 2015, the ESO 45m OWL telescope and several others, we will soon also have far more raw resolution power to work with.

    But to answer the question:
    The Gliese 581-system is a small dwarf-star surrounded by at least 4 planets, out of which 2 are gas-giants and one is an icy planet. But the fourth planet - Gliese581C is a rocky planet5x heavier than Earth, which is covered with a deep ocean!

    How do we know this?
    Fairly "simple": It has been discovered through the transit method, which allow the astronomers to measure its diameter, based on how much light it's shadow "steals" from the mother-star. Based on the start wobble, it's mass camn be measured.

    This has lead to tyhe conclusion, that it has density of 2,5. And since gas is <1, ice is 1 and rock is 4, it has to have a large rocky core, but mixed with plenty of ice, liquid (water, COx or methane) or gas (atmosphere).

    Considering that it is in the bio-zone from the star it has been estimated that it has a surface temperature of 0-20'C.

    See more on Gliese581 on Wikipedia

    /Best regards

    Last edited by a moderator: May 4, 2017
  12. Aug 16, 2010 #11
    If we do finally a detect a habitable planet it will be frustrating for mankind to have to wait until interstellar travel becomes possible in order to visit it. That's it ever does become possible of course.
  13. Aug 16, 2010 #12
    it wont be frustrating at all. if a habital planet is ever found, each and every human on Earth will demand vacations there and ALL research will be directed toward reaching it... I PROMISE YOU THAT
    Last edited: Aug 16, 2010
  14. Aug 16, 2010 #13


    User Avatar
    Science Advisor
    Homework Helper

    If history is any guide a small proportion of people will move there and then spend large amounts of time, money and effort keeping those other aliens out
  15. Aug 16, 2010 #14
    lets just hope weve evolved better than that...who am i kidding, those aliens are FRAKKING SCREWED
  16. Aug 17, 2010 #15
    That's the pity of it all. We take all our foibles with us and that's not good for us nor for others.
  17. Nov 17, 2010 #16
    I think there's a lot of conditions to be accomplished for a planet to support life. And i think that we don't know everything of that.
  18. Nov 17, 2010 #17


    User Avatar
    Science Advisor
    Gold Member

    I doubt we much competion for seeding the galaxy with humanity. Until we find a big sign saying "%& $^*" [eat more embryonic amphibians], the galaxy is our plumb.
  19. Nov 19, 2010 #18
    What's a star for us is a sun for them.
    Wanna see what an alien looks like?
    Look in the mirror.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook